<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/dog_logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表达验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入活动名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入活动名称', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  created() {},
  mounted() {},
  methods: {
    // 重置登录表单
    resetLoginForm() {
      // 指向实例对象
      //   console.log(this);
      //   $refs: {loginFormRef: VueComponent}
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid) // 成功 打印ture 反之
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res) // Promise {<pending>}
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        // 保存token到客户端中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编制式导航跳转后台主页 路由地址式 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style scoped lang="less">
// 首页全局背景
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}

// 登录表单区域绘制
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  // 页面居中
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  // logo
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    top: -50%;
    transform: translate(-50%, 50%);
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
